New York weather in September
September in New York: warm, rainy, with clean air — an excellent time to visit.
#3 of 12 months in New York · #174 of 604 destinations to visit in September · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
New York climate normals — September
| Daytime high | 24°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Feels like (high) | 25°C / 77°F | |
| Rainfall | 103 mm / 4 in | 🌧 rainy |
| Rainy days | 9 days | |
| Humidity | 75% | 💧 humid |
| Dew point | 15°C / 58°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12.5 h | |
| Wind | 15 km/h / 10 mph | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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New York in September — FAQ
- Is September a good time to visit New York?
- September in New York: warm, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for New York on SeasonMap's comfort score (86/100).
- What is the weather like in New York in September?
- In September, New York averages a daily high of 24.2°C and a low of 16.5°C, with about 102.5 mm of rain over roughly 8.8 rainy days.
- What is the air quality in New York in September?
- New York has a mean US Air Quality Index of about 50 in September.